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ELSA: storing local energy thanks to second life batteries

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On 7 November 2018, we will present, during the European Utility Week in Vienna, Austria, the results of more than three years of work on the ELSA project. ELSA is an efficient and environmentally friendly energy storage system. It uses recycled batteries from electric vehicles and a smart energy management system in order to provide innovative services through a number of applications.

Projects surrounding sustainable and energy self-sufficient neighbourhoods have multiplied, but their development has been hindered by the intermittency of renewable energy sources and the cost of storage technology. In addition, local energy storage is one of the key elements of our future energy supply system. It makes it possible to balance production and demand and will thus be the cornerstone of a smart energy network.

ELSA (or Energy Local Storage Advanced) is an energy storage project funded by the European Union (EU) as part of the Horizon 2020 programme under the theme of small-scale storage.

By giving a second life to electric vehicle batteries, before their final recycling within the context of a circular economy, ELSA not only helps to keep the prices of batteries down in new vehicles but also promotes the development of electric vehicles.

Reusing batteries from electric vehicles to generate power in buildings is a win-win system. The idea is to go from the car to the building, without having to refurbish the battery cells for this solution to be cost-effective - explains Servan Lacire, Innovation & Technology Manager.

The developed system proposes to integrate, without refurbishment, all battery models available in electric vehicles today. This includes those from Renault vehicles (350,000 sold in 2016) as well as those used by other car manufacturers.

This European project has helped implement practical storage solutions that are compliant with the highest safety standards in the automotive industry and at a competitive price.

The standardised storage systems developed will be adaptable and easy to roll out. For example, for electric vehicle quick recharge stations in neighbourhoods or commercial buildings, they help boost self-sufficiency while balancing the demand in electricity and local photovoltaic production.

Prototypes have been installed on six sites throughout Europe: Ampère building in La Défense, NISSAN head office in Montigny, Distribution network in Terni (Italy), Building in Gateshead (UK), Residential neighbourhood in Kempten (Germany), and all the Buildings at Aix-la-Chapelle University (Germany). They cover several applications and a wide range of services, including the reduction of network congestion, the local balancing of the network, and voltage support or regulation.

At Challenger, the head office of Bouygues Construction located in Guyancourt in Yvelines, the prototype stores the power produced by the roof’s solar panels. It is comprised of five lithium-ion batteries originating from Renault electric vehicles (four from Kangoo and one Zoé), and one from a Nissan Leaf car.

The Challenger prototype has a capacity of 12 kWh, and no drop in capacity has been observed thus far.

In a building, operation cycles are very regular. The battery is under less strain than it would be in a vehicle, thus prolonging its lifespan - explains Eric Portales, Project Manager at our Innovation & Technology Department.